Erlin, 22, has been recalled from Triple-A Tucson to start in Edinson Volquez’s first spot. Volquez was formally released by the Padres Tuesday after clearing waivers. He was designated for assignment last Saturday. Wednesday starts Erlin’s fourth tour with the Padres this season. He made his major league debut on April 30 with the first of two relief appearances at Wrigley Field in Chicago. This will be his fifth start as a Padre and the first time in his career that he has faced Arizona. After two solid starts, Erlin allowed 12 runs on 11 hits and seven walks over just 7 2/3 innings in his two most recent starts. His most recent outing with the Padres was on July 7 in Washington. Erlin was 8-3 with a 5.07 ERA in 20 starts for Triple-A Tucson.

Diamondbacks LHP Wade Miley (9-8, 3.60 ERA)

With one more win, Miley will join Randy Johnson (1999-2002) as only the second Diamondbacks left-hander ever to win 10 or more games in back-to-back seasons. Miley is 3-0 with a 2.36 ERA over his last six starts and 5-1 with a 2.26 ERA over his last 10 starts. Miley is 4-0 with a 2.39 ERAS in his last five home starts at Chase Field. He is 0-3 in three starts against the Padres this season with a 7.36 ERA. Miley has a 1-5 career record against the Padres with a 6.57 ERA in eight starts.